Results are presented on an investigation of photons produced in multihadronic final states frome + e − annihilation at 35 GeV and 44 GeV center of mass energies. Scalling violation between 14 and 44 GeV is observed in inclusive photon spectra. Comparing inclusive π0 spectra with charged pion spectra it is found that the average π0 multiplicity exceeds the charged pion multiplicity scaled by factor of 0.5 by (16±5)% and (21±7)% at 35 and 44 GeV respectively. The excess can be attributed to isospin violating decays of hadrons. The η multiplicity is found to be 〈n η〈=0.64±0.09±0.06 at 35 GeV. With a significance of three standard deviations a signal from quark bremsstrahlung is observed. The measured charge asymmetry in hadronic final states, due to the interference between initial and final state radiation, ofA=−0.141±0.041 is in accord with QED expectations. An interference effect in the azimuth angle distribution of charged jets around the photon direction is observed for the first time.
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T.F. Walsh, P. Zerwas: Phys. Lett. 44B (1973) 195
JADE-Coll., W. Bartel et al.: Z. Phys. C—Particles and Fields 28 (1985) 343
JADE-Coll., W. Bartel et al.: Phys. Lett. 88B (1979) 171
T. Sjöstrand: Comp. Phys. Commun. 27 (1982) 243; T. Sjöstrand: Comp. Phys. Commun. 28 (1983) 229; T. Sjöstrand, M. Bengtsson: Comp. Phys. Commun. 43 (1987) 367
TASSO-Coll. W. Braunschweig et al.: Z. Phys. C—Particles and Fieldss42 (1989) 189
F.A. Berends, R. Kleiss, S. Jadach: Nucl. Phys. B202 (1982) 63; F.A. Berends, R. Kleiss, S. Jadach: Comp. Phys. Commun. 29 (1983) 185
J.R. Cudell, F. Halzen, F. Herzog: Phys. Lett. 140B (1984) 83
E. Laerman, T.F. Walsh, I. Schmitt, P.M. Zerwas: Nucl. Phys. B207 (1982) 205
MAC-Coll., E. Fernandez et al.: Phys. Rev. Lett. 54 (1985) 95; MARK II-Coll., M.S. Gold: Ph.D. Thesis LBL-22433; TASSO-Coll., W. Braunschweig et al.: Z. Phys. C—Particles and Fields 1 (1988) 385
H.J. Lipkin: Phys. Lett. 85B (1979) 236; T. Jayaraman, G. Rajasekaran, S.D. Rindani: Phys. Rev. D 32 (1985) 1262; X.-G. He, S. Pakvasa, G. Rajasekaran, S.D. Rindani: Phys. Lett. B185 (1987) 158
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JADE Collaboration., Pitzl, D.D., Allison, J. et al. A study of photon production in hadronic events frome + e − annihilation. Z. Phys. C - Particles and Fields 46, 1–7 (1990). https://doi.org/10.1007/BF02440827
- Charge Asymmetry
- Charged Pion
- Initial State Radiation
- Hadronic Event
- Quark Charge